Depending on its diameter it's a Bohemond VII 'Cross & Castle' Crusader Groat which is about 26/27mm. The legend around the castle reads CIVITAS TRIPOLIS SVRIE which is Trabli, now in Lebanon. The obverse, around the cross, reads +SEPTIMIVS BOEMVNDVS COMES. Circa 1278. Whether it's genuine or not is a different question. The 'silver' looks a little suspect from the images, it is hard to tell.